How PHP determines if the STR string is not an XML-formatted data detailed

This article mainly introduces PHP to determine whether STR string is an XML format data method, combined with the case of the form of a more detailed analysis of PHP using custom functions for XML Format data validation of the relevant operation skills, the need for friends can refer to the next

This article describes how PHP determines whether STR strings are data in XML format. Share to everyone for your reference, as follows:

<?php//custom XML Validation function Xml_parser () function Xml_parser ($str) {$xml _parser = Xml_parser_create ();      if (!xml_parse ($xml _parser, $str, True)) {Xml_parser_free ($xml _parser);    return false;    }else {return (Json_decode (Json_encode (simplexml_load_string ($STR)), true)); }}//Application Example: $xmlstr =<<<eto<?xml version= "1.0" encoding= "UTF-8"?><books> <book> <author >jack herrington</author> <title>php hacks</title> <publisher>o ' Reilly</publisher > </book> <book> <author>jack herrington</author> <title>podcasting hacks</tit    Le> <publisher>o ' reilly</publisher> </book> <book> <author>xml data </author> <title> Scripting House </title> <publisher>tools.jb51.net</publisher> </book></books>eto ; $jsonstr = ' {' Tools ': [{' Name ': ' CSS format ', ' site ': ' Http://tools.jb51.net/code/css '}, {' name ': ' JSON format ', ' site ' :"Http://tools.jb51.net/code/json"}, {"Name": "pwd Check", "Site": "Http://tools.jb51.net/password/my_password_safe" }]} '; if (Xml_parser ($XMLSTR)) {echo "\ $XMLSTR is XML format data";} else{echo "\ $XMLSTR not XML Format data";} echo "<br/>"; if (Xml_parser ($JSONSTR)) {echo "\ $JSONSTR is XML format data";} else{echo "\ $JSONSTR not XML Format data";}? >

Operation Result:

$XMLSTR is XML format data $jsonstr not XML format data